sysctl.conf

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fs.nr_open = 5242880
fs.file-max = 4194304
kernel.core_uses_pid = 1
kernel.msgmax = 1048560
kernel.msgmnb = 1073741824
kernel.shmall = 4294967296
kernel.shmmax = 68719476736
kernel.sysrq = 0
net.core.netdev_max_backlog = 1048576
net.core.rmem_default = 2097152
net.core.rmem_max = 16777216
net.core.somaxconn = 1048576
net.core.wmem_default = 2097152
net.core.wmem_max = 16777216
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.ip_forward = 1
net.ipv4.ip_local_port_range = 1024    65000
net.ipv4.neigh.default.gc_thresh1 = 10240
net.ipv4.neigh.default.gc_thresh2 = 40960
net.ipv4.neigh.default.gc_thresh3 = 81920
net.nf_conntrack_max = 819200
net.netfilter.nf_conntrack_max = 819200
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 1048576
net.ipv4.tcp_max_tw_buckets = 50000
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_reordering = 5
net.ipv4.tcp_retrans_collapse = 0
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_rmem = 4096        87380   4194304
net.ipv4.tcp_sack = 1
net.ipv4.tcp_synack_retries = 1
# SynCookies在生产环境上似乎只起到过副作用
net.ipv4.tcp_syncookies = 0
net.ipv4.tcp_syn_retries = 1
# 下面两个建议关掉，是个坑。
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_wmem = 4096        16384   4194304
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
vm.swappiness = 0
# 这几个是为了多网卡不同IP段设计的，允许IP欺骗（CentOS6默认禁止）
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.eth0.rp_filter = 0
net.ipv4.conf.eth1.rp_filter = 0
net.ipv4.conf.eth2.rp_filter = 0
net.ipv4.conf.eth3.rp_filter = 0
net.ipv4.conf.bond0.rp_filter = 0
# KVM官方推荐的优化配置
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0